Not outdated yet, but I found several sales that lower the range / previous suggestion had no overpay calculations anywhere

Sale #1

http://www.tf2outpost.com/trade/21806211

I bought this hat for one bud pure, 5 ref, two tour of duty tickets, and about 8 ref in sweets

1 bud + 2.5 keys after overpay = 1.1 buds

http://i.imgur.com/FZ0iPCb.png?1

Sale #2

I sold mine + 5 keys, 4 ref, and some sweets (~4 ref) for a disco beat down german gonzila

1.8 buds * 0.9 = 1.6 buds, - 6 keys= 1.3 buds

http://i.imgur.com/b1N2JxD.png

Sale #3

http://www.tf2outpost.com/trade/22376069

Sold for an orbiting fire scotch bonnet + 2 keys

1.1 buds * 0.9 = 1 bud + 2 keys = 1.1 buds

Sale #4

This sale if from the previous suggestion, it still fits in the 2 month time frame

http://www.tf2outpost.com/trade/21174944

Sold for a steaming tossle, seller added 2 keys

1.7 * 0.9 = 1.5, - 2 keys = 1.4 buds

http://puu.sh/az3vm/140d0093b1.jpg

Sale #5

This sale if from the previous suggestion, it still fits in the 2 month time frame

http://www.tf2outpost.com/trade/21237931

Sold for a bubbling drill hat + 8 keys

1 bud * 0.9 = 0.9 buds + 8 keys = 1.3 buds

Other things of note

http://www.tf2outpost.com/trade/21523530 - Was selling for 20 keys pure, not sure if it sold for that much. Turned down 1.4 in unusuals.